1. National Council on Disabilities. In: The Current State of Transportation for People with Disabilities in the United States, 1331 F Street, NW, Suite 850, Washington, D.C. 20004 (June 2005)
2. Stern, S., Brault, M.: Disability Data From the American Community Survey: A Brief Examination of the Effects of Question Redesign in 2003 (January 2005)
3. Wood, T.: When your plan is a van: Decisions, Decisions A Guide to Asking the Right Questions and Choosing the Best Vehicle for You. Quest - Journal of the Muscular Dystrophy Association 11(2) (March-April 2004)
4. Miller, D., Slack, M.: Design and testing of a low-cost robotic wheelchair prototype. Autonomous Robots 1(3) (1995)
5. Yanco, H.: Wheelesley, a robotic wheelchair system: indoor navigation and user interface. In: Assistive Technology and Artificial Intelligence. LNCS (LNAI), pp. 256–268 (1998)